TY  - BOOK
AU  - Bir, S.S..
TI  - Aspects of Plant Sciences, vol.6: Pteridophytes, their Morphology, Cytology, Taxonomy and Phylogeny / 
U1  - I4:2 
PY  - 1982///
CY  - New Delhi : 
PB  - today and tomorrpw's Printers & Publishers , 
KW  - Botany <Pteridophytes>
ER  -